Manufacture of a 2-m mirror with a glass membrane facesheet and active rigid support

James H. Burge; Brian Cuerden; Stephen M. Miller III; Robert C. Crawford; Helmuth H. Dorth; David G. Sandler; Richard W. Wortley

doi:10.1117/12.369178

11 November 1999 Manufacture of a 2-m mirror with a glass membrane facesheet and active rigid support

James H. Burge, Brian Cuerden, Stephen M. Miller III, Robert C. Crawford, Helmuth H. Dorth, David G. Sandler, Richard W. Wortley

Author Affiliations +

Proceedings Volume 3782, Optical Manufacturing and Testing III; (1999) https://doi.org/10.1117/12.369178
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A 2-m diameter mirror is being manufactured as a demonstration for NASA's Next Generation Space Telescope (NGST). This mirror meets the challenging requirements of cryogenic operation and very low mass using an active control system. The mirror system consists of an aluminized glass membrane, 2 mm thick. This membrane is supported and controlled based on wavefront measurements with 169 remotely driven actuators. The system rigidity is provided by a lightweight carbon fiber composite structure. This entire mirror system, 2 meters across weighs less than 40 kg, and will demonstrate 20 nm surface quality in a cryogenic test facility at 35 K.

Citation Download Citation

James H. Burge, Brian Cuerden, Stephen M. Miller III, Robert C. Crawford, Helmuth H. Dorth, David G. Sandler, and Richard W. Wortley "Manufacture of a 2-m mirror with a glass membrane facesheet and active rigid support", Proc. SPIE 3782, Optical Manufacturing and Testing III, (11 November 1999); https://doi.org/10.1117/12.369178

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